Michael Grace

I don’t think it’s a good idea to leave

console.log

statements in production code, it’s a good idea to prevent your site from breaking if you accidentally do. I include this condition in the first script that loads on the page of most of my projects

if (typeof console == "undefined") {
    window.console = {
        log: function () {}
    };
}

This JavaScript simply defines an empty function if the console is not available in the browser so stray log statements don’t break production for your valuable customers.